package tcp;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Scanner;

public class TcpThreadEchoServer {
    private ServerSocket socket=null;

    public TcpThreadEchoServer(int port) throws IOException {
        socket=new ServerSocket(port);
    }

    public void start() throws IOException {
        System.out.println("服务器启动");
        while (true){
            Socket clientSocket=socket.accept();

            Thread t=new Thread(()->{
                processConnection(clientSocket);
            });
            t.start();
        }
    }

    private void processConnection(Socket clientSocket) {
        System.out.printf("[%s:%d] 客户端建立连接\n",clientSocket.getInetAddress().toString(),clientSocket.getPort());
        try(InputStream inputStream=clientSocket.getInputStream()){
            try(OutputStream outputStream=clientSocket.getOutputStream()) {
                Scanner scanner=new Scanner(inputStream);
                while (true){
                    if(!scanner.hasNext()){
                        System.out.printf("[%s:%d] 客户端断开连接！",clientSocket.getInetAddress().toString(),clientSocket.getPort());
                        break;
                    }
                    String request=scanner.next();
                    String response=process(request);
                    PrintWriter writer=new PrintWriter(outputStream);
                    writer.println(response);
                    writer.flush();
                    System.out.printf("[%s:%d] req: %s, resp: %s\n",clientSocket.getInetAddress().toString(),clientSocket.getPort(),request,response);
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            try {
                clientSocket.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    private String process(String request) {
        return request;
    }

    public static void main(String[] args) throws IOException {
        TcpThreadEchoServer server=new TcpThreadEchoServer(9090);
        server.start();
    }
}
